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一手扯孙子，板栗葫芦叫不停，都不知先跟谁打招呼好。Charm 6: 501-8000TCP works in the Transport layer, IP in the Network layer, and ARP in the DataLink layer; The data on the second layer is called Frame, the data on the third layer is called Packet, and the data on the fourth layer is called Segment. At the same time, we need to simply know that when data is sent from the application layer, header information will be added to each layer, encapsulated, and then sent to the data receiving end. This basic process you need to know, that is, every data will go through the process of data encapsulation and unencapsulation.3.2. 2 Turn on the event schedulerIf an attack is detected, the management center will start a cleaning scheme to pull the mixed traffic of attack traffic and normal traffic through BGP, CDN, etc. Pull the mixed flow to the flow cleaning center for cleaning. The problem in the process of traffic cleaning is that the current DDOS attacks present a mixed attack state with multiple attack methods coexisting. In this case, how to efficiently detect attacks is the main problem currently facing. After consulting numerous data, Huawei's "seven-layer cleaning plan" is found to be very enlightening. The scheme comprehensively analyzes data packets for mixed traffic through seven layers of defense measures such as static filtering, abnormal message filtering, scanning and snooping message filtering, source legitimacy authentication, session-based prevention, feature identification filtering and traffic shaping, so as to detect attack traffic to the greatest extent. The framework of Huawei's "seven-layer cleaning scheme" is shown in Figure 2. After the traffic is cleaned, the attack traffic is discarded, and the normal traffic is injected back into the network through MPLS, GRE tunnel technology, etc.爱丽丝一脸期待地看着陈启。